<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }
    
    li {
        list-style-type: none;
    }
    
    .tab {
        width: 978px;
        margin: 100px auto;
    }
    
    .tab_list {
        height: 39px;
        border: 1px solid #ccc;
        background-color: #f1f1f1;
    }
    
    .tab_list li {
        float: left;
        height: 39px;
        line-height: 39px;
        padding: 0 20px;
        text-align: center;
        cursor: pointer;
    }
    
    .tab_list .current {
        background-color: #c81623;
        color: #fff;
    }
    
    .item_info {
        padding: 20px 0 0 20px;
    }
    
    .item {
        display: none;
    }
</style>

<body>
    <div class="tab">
        <div class="tab_list">
            <ul>
                <li class="current">商品介绍</li>
                <li>规格与包装</li>
                <li>售后保障</li>
                <li>商品评价（50000）</li>
                <li>手机社区</li>
            </ul>
        </div>
        <div class="tab_con">
            <div class="item" style="display: block;">
                商品介绍模块内容
            </div>
            <div class="item">
                规格与包装模块内容
            </div>
            <div class="item">
                售后保障模块内容
            </div>
            <div class="item">
                商品评价（50000）模块内容
            </div>
            <div class="item">
                手机社区模块内容
            </div>

        </div>
    </div>
    <script>
        var tab_list = document.querySelector('.tab_list');
        var lis = tab_list.querySelectorAll('li');
        var items = document.querySelectorAll('.item');
        for (var i = 0; i < lis.length; i++) {
            lis[i].setAttribute('index', [i]);
            lis[i].onclick = function() {
                for (var i = 0; i < lis.length; i++) {
                    lis[i].className = '';
                }
                this.className = 'current';
                //给每个小li设置属性
                var index = this.getAttribute('index');
                //  console.log(index);
                for (var i = 0; i < items.length; i++) {
                    items[i].style.display = 'none';
                }
                items[index].style.display = 'block';
            }
        }
    </script>
</body>

</html>